SpringBoot 整合 JDBC 实例

0、数据库表

CREATE DATABASE springboot;

USE springboot;

CREATE TABLE `user` (

  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键',

  `name` varchar(50) DEFAULT NULL COMMENT '姓名',

  `age` int(11) DEFAULT NULL COMMENT '年龄',

  PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

INSERT INTO  user values (1,"村雨遥",25);

INSERT INTO  user values (2,"张三",26);

INSERT INTO  user values (3,"李四",27);

　　

pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.3.4.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.example</groupId>

    <artifactId>JDBCPrac</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>JDBCPrac</name>

    <description>Demo project for Spring Boot</description>

    <properties>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <!--    Web 模块依赖    -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <!--    SQL 模块依赖    -->

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <scope>runtime</scope>

        </dependency>

        <!--    Jdbc Template 模块依赖    -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-jdbc</artifactId>

        </dependency>

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <version>1.18.24</version>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-test</artifactId>

            <version>3.0.2</version>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.junit.jupiter</groupId>

            <artifactId>junit-jupiter-api</artifactId>

            <version>5.9.2</version>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

　　

1、

package com.cunyu.controller;

import com.cunyu.pojo.User;

import com.cunyu.service.UserService;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

import org.springframework.web.servlet.ModelAndView;

import java.util.List;

/**

 * @author : cunyu

 * @version : 1.0

 * @className : UserController

 * @date : 2020/7/29 16:22

 * @description : UserController

 */

@RequestMapping("/user")

@RestController

public class UserController {

    private static final Logger logger = LoggerFactory.getLogger(UserController.class);

    private final UserService userService;

    public UserController(UserService userService) {

        this.userService = userService;

    }

    @GetMapping("/list")

    public List<User> getUsers() {

        logger.info("从数据库读取数据");//打印到console

        return userService.getList();

    }

}

　　

2、User Bean

package com.cunyu.pojo;

import lombok.AllArgsConstructor;

import lombok.Data;

import lombok.NoArgsConstructor;

import org.springframework.stereotype.Component;

/**

 * @author : cunyu

 * @version : 1.0

 * @className : Author

 * @date : 2020/7/29 16:20

 * @description : User 实体类

 */

@Component

@Data

@AllArgsConstructor

@NoArgsConstructor

public class User {

    private Long id;

    private String name;

    private Integer age;

}

　　

3

package com.cunyu.service;

import com.cunyu.pojo.User;

import java.util.List;

/**

 * @author : cunyu

 * @version : 1.0

 * @className : UserService

 * @date : 2020/7/29 21:12

 * @description : TODO

 */

public interface UserService {

    /**

     * @param

     * @return

     * @description 获取所有数据列表

     * @date 2020/7/29 21:57

     * @author cunyu1943

     * @version 1.0

     */

    public List<User> getList();

}

　　

4

package com.cunyu.service.Impl;

import com.cunyu.pojo.User;

import com.cunyu.service.UserService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.jdbc.core.JdbcTemplate;

import org.springframework.jdbc.core.RowMapper;

import org.springframework.stereotype.Service;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.List;

/**

 * @author : cunyu

 * @version : 1.0

 * @className : UserServiceImpl

 * @date : 2020/7/29 21:13

 * @description : TODO

 */

@Service

public class UserServiceImpl implements UserService {

    private final JdbcTemplate jdbcTemplate;

    public UserServiceImpl(JdbcTemplate jdbcTemplate) {

        this.jdbcTemplate = jdbcTemplate;

    }

    @Override

    public List<User> getList() {

        String sql = "SELECT id, name, age FROM user";

        return (List<User>) jdbcTemplate.query(sql, new RowMapper<User>() {

            @Override

            public User mapRow(ResultSet resultSet, int i) throws SQLException {

                User user = new User();

                user.setId(resultSet.getLong("id"));

                user.setName(resultSet.getString("name"));

                user.setAge(resultSet.getInt("age"));

                return user;

            }

        });

    }

}

　　

5

package com.cunyu;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class JdbcPracApplication {

    public static void main(String[] args) {

        SpringApplication.run(JdbcPracApplication.class, args);

    }

}

　　

浏览器访问 localhost:8080/user/list

项目代码：https://github.com/bfx1000/SpringBoot_JDBC

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